According to a survey of workers, 4/50 of them walk to work, 3/50 bike, 10/50 carpool, and 33/50 drive alone. What percent of workers walk or bike to work?

Pamela has a 30-year, 5.75% mortgage on her $250,000 home. she has been paying on it for 5 years, and has recently hit some financial trouble. if her lender agreed to lower the interest rate on her $231,905.47 balance to 5.5%, what will her new payment be for the remainder of the loan?